Journal ArticleDOI
Cryomilled nanostructured materials: Processing and properties
TLDR
In this article, the deformation behavior and underlying mechanisms that govern Cryomilled materials are discussed and compared with those of nanostructured materials processed via other methods, in an effort to shed light into the fundamental behavior of ultra-fine-grained and nanobased materials.Abstract:
Nanostructured (i.e., 1–200 nm grain size) and ultrafine-grained (i.e., 200–500 nm grain size) metals are of interest, not only as a result of their unusual combinations of physical and mechanical properties, but also because they can be readily synthesized using well-developed synthesis techniques. Cryomilling, i.e., mechanical alloying in liquid nitrogen, is representative of a class of synthesis techniques that attain the nanostructured state via severe plastic deformation. In this overview, published data related to cryomilled materials are reviewed and discussed with particular emphasis on cryomilling mechanisms; microstructure and thermal stability of cryomilled powders; primary consolidation and secondary processing methods; microstructural evolution during consolidation; and mechanical response of consolidated materials. The deformation behavior and the underlying mechanisms that govern cryomilled materials are discussed and compared with those of nanostructured materials processed via other methods, in an effort to shed light into the fundamental behavior of ultrafine-grained and nanostructured materials.read more
Citations
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Journal ArticleDOI
Mechanical Behavior and Strengthening Mechanisms in Ultrafine Grain Precipitation-Strengthened Aluminum Alloy
Kaka Ma,Haiming Wen,Haiming Wen,Tao Hu,Troy D. Topping,Dieter Isheim,David N. Seidman,Enrique J. Lavernia,Julie M. Schoenung +8 more
TL;DR: In this article, the relationship between precipitation phenomena, grain size and mechanical behavior in a complex precipitation-strengthened alloy system, Al 7075 alloy, a commonly used aluminum alloy, was selected as a model system in the present study.
Journal ArticleDOI
Strengthening Mechanisms in a High-Strength Bulk Nanostructured Cu-Zn-Al Alloy Processed Via Cryomilling and Spark Plasma Sintering
TL;DR: In this paper, three-dimensional atom-probe tomography studies demonstrate that the distribution of Al is highly inhomogeneous in the sintered bulk samples, and Al-containing precipitates including Al(Cu,Zn)−O−N, Al-O-N and Al−N are distributed in the matrix.
Journal ArticleDOI
Heterostructured materials: superior properties from hetero-zone interaction
Yuntian Zhu,Kei Ameyama,Peter M. Anderson,Irene J. Beyerlein,Huajian Gao,Hyoung Seop Kim,Enrique J. Lavernia,Suveen N. Mathaudhu,Haël Mughrabi,Robert O. Ritchie,Nobuhiro Tsuji,Xiangyi Zhang,Xiaolei Wu +12 more
Abstract: Heterostructured materials are an emerging class of materials with superior performances that are unattainable by their conventional homogeneous counterparts. They consist of heterogeneous zones wi...
Journal ArticleDOI
From Powders to Thermally Sprayed Coatings
TL;DR: In this paper, the relationship existing between coating properties and structures at different scales and manufacturing processes is discussed, and the advantages and drawbacks of the self-propagating high-temperature synthesis, depending very strongly upon the starting composite particle manufacturing process.
Journal ArticleDOI
Coupling of dislocations and precipitates: Impact on the mechanical behavior of ultrafine grained Al–Zn–Mg alloys
Kaka Ma,Tao Hu,Tao Hu,Hanry Yang,Troy D. Topping,Troy D. Topping,Ali Yousefiani,Enrique J. Lavernia,Julie M. Schoenung +8 more
TL;DR: In this paper, the authors show that coupling of dislocations and precipitates within the ultrafine grains has a beneficial impact on the mechanical behavior and results in an extremely high strength, i.e., ultimate tensile strength ∼878 MPa, with uniform elongation of 4.1% strain at fracture.
References
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Journal ArticleDOI
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TL;DR: The mechanical alloying process as mentioned in this paper is an entirely solid state process, permitting dispersion of insoluble phases such as refractory oxides and addition of reactive alloying elements such as aluminum and titanium.
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Structural and thermodynamic properties of nanocrystalline fcc metals prepared by mechanical attrition
TL;DR: In this article, the deformation process causes a decrease of the grain size of the fcc metals to 6-22 nm for the different elements, and the final grain size scales with the melting point and the bulk modulus of the respective metal.
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The physics of mechanical alloying: A first report
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TL;DR: In this article, the geometry of the collision events which lead to particle fragmentation and coalescence is modeled on the basis of Hertzian contacts between the grinding media which entrap a certain amount of material volume between the impacting surfaces.
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Nanostructure formation by mechanical attrition
TL;DR: In this paper, high energy ball milling has been used as a versatile alternative to other processing routes, including vapor evaporation, liquid quenching and chemical synthesis methods.